| /* |
| * Copyright 2017-present Open Networking Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.onosproject.incubator.net.virtual.impl.intent; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.Maps; |
| import org.onosproject.net.intent.Intent; |
| import org.onosproject.net.intent.IntentInstaller; |
| |
| import java.util.Map; |
| |
| /** |
| * The local registry for Intent installer for virtual networks. |
| */ |
| public final class VirtualIntentInstallerRegistry { |
| private final Map<Class<? extends Intent>, |
| IntentInstaller<? extends Intent>> installers; |
| |
| // non-instantiable (except for our Singleton) |
| private VirtualIntentInstallerRegistry() { |
| installers = Maps.newConcurrentMap(); |
| } |
| |
| public static VirtualIntentInstallerRegistry getInstance() { |
| return SingletonHelper.INSTANCE; |
| } |
| |
| /** |
| * Registers the specific installer for the given intent class. |
| * |
| * @param cls intent class |
| * @param installer intent installer |
| * @param <T> the type of intent |
| */ |
| public <T extends Intent> void registerInstaller(Class<T> cls, IntentInstaller<T> installer) { |
| installers.put(cls, installer); |
| } |
| |
| /** |
| * Unregisters the installer for the specific intent class. |
| * |
| * @param cls intent class |
| * @param <T> the type of intent |
| */ |
| public <T extends Intent> void unregisterInstaller(Class<T> cls) { |
| installers.remove(cls); |
| } |
| |
| /** |
| * Returns immutable set of binding of currently registered intent installers. |
| * |
| * @return the set of installer bindings |
| */ |
| public Map<Class<? extends Intent>, IntentInstaller<? extends Intent>> getInstallers() { |
| return ImmutableMap.copyOf(installers); |
| } |
| |
| /** |
| * Get an Intent installer by given Intent type. |
| * |
| * @param cls the Intent type |
| * @param <T> the Intent type |
| * @return the Intent installer of the Intent type if exists; null otherwise |
| */ |
| public <T extends Intent> IntentInstaller<T> getInstaller(Class<T> cls) { |
| return (IntentInstaller<T>) installers.get(cls); |
| } |
| |
| /** |
| * Prevents object instantiation from external. |
| */ |
| private static final class SingletonHelper { |
| private static final String ILLEGAL_ACCESS_MSG = |
| "Should not instantiate this class."; |
| private static final VirtualIntentInstallerRegistry INSTANCE = |
| new VirtualIntentInstallerRegistry(); |
| |
| private SingletonHelper() { |
| throw new IllegalAccessError(ILLEGAL_ACCESS_MSG); |
| } |
| } |
| } |